Luminescence properties of Eu2+-activated Sr5(PO4)2(SiO4) for green-emitting phosphor

Abstract A green-emitting phosphor of Eu 2+ -activated Sr 5 (PO 4 ) 2 (SiO 4 ) was synthesized by the conventional solid-state reaction. It was characterized by photoluminescence excitation and emission spectra, and lifetimes. In Sr 5 (PO 4 ) 2 (SiO 4 ):Eu 2+ , there are at least two distinguishable Eu 2+ sites, which result in one broad emission situating at about 495 nm and 560 nm. The phosphor can be efficiently excited in the wavelength range of 250–440 nm where the near UV (～ 395 nm) Ga(In)N LED is well matched. The dependence of luminescence intensities on temperature was investigated. With the increasing of temperature, the luminescence of the phosphor shows good thermal stability and stable color chromaticity. The luminescence characteristics indicate that this phosphor has a potential application as a white light emitting diode phosphor.